Tie rod shield extracting tool



Aug. 4, 1942- s. s. coL'r' 2,291,795

TIE ROD SHIELD EXTRACTING TOOL Filed Aug. 26, 1941 2 Sheets-Sheet 2 INVENTOK animal/6'. 6527;,

Patented Aug; 4, 1942 UNITED .JSTAITES' PATENT Qm frm non snmLn Ex'raAc'rmG 'roor.

' Samuel S. Colt, West Orange, N. J. V Applidation August 26, 1941, Serial No. 408,309

9 claims. (Cl. 294-403) This invention relates to means for manipulating and extracting from a cast concrete structure shield tubes employed to envelop the form wall tie form in which the concrete structure was cast.

- rods and other internally disposed parts of the In my co-pending application for United States Letters Patent Serial'No. 406,147, I have disclosed a novel tubular means for shielding the tie rods and other internally disposed parts of wall retaining or tying means of a concrete casting form against contact with the concrete poured into the latter, whereby such tie rods etc. may be easily removed and salvaged when the form isdismantled from the completed concrete structure formed therein. In the use of such shielding means, it is desirable to remove the same, in I whole or in part, from the completed concrete structure, so that. voids left in the latter by structure; The tubular shielding means jabove referred to is made of material adapted to yield to torsionally applied force, whereby the same will contract diametrically when twisted so that it will be separated from contiguous surfaces of an enveloping cast concrete mass, subject to easy withdrawal from the latter. r

'This invention therefore has for an object to provide a novel tool for application to a tubular shield device of the kind mentioned, which is subject to manipulation so as to torsionally twist the removal of the tie-rods etc., may be plugged and .pointed up, at least as to the portions thereof adjacent to the exterior faces of said concrete shield tube to diametrically contract the same, Y

and thus loosen it from a surrounding concrete mass, while at the same time so engaging or gripping'the shield tube as to permit transmission thereto, or to a predetermined part thereof, of

withdrawing movement, whereby to extract the same from the concrete masssafter it is loosened therefrom by torsionally efiected contraction. f 'Other objects of this invention, not at this-time more particularly enumerated, will be understood from the following detailed description of the same. I Illustrative embodiments of this invention are shown in the accompanying drawings, in which:

Fig, 1 is a fragmentary vertical sectionalview througha cast concrete mass, the same showing application to a shield tube imbedded therein of the manipulating and extracting tool by operation of which said shield tube may be contracted and withdrawn, said tool being shown in side elevation; Fig. 2 isa horizontal sectional view, taken on line 2-2 in Fig 1,-the tool :being shown in elevation; Fig. 3 is a vertical sectional view, taken on line 3-3 in Fig. 2, the tool being shown in elevation; and Fig. 4 is a view similar to that of Fig. 1, but showing operative manipulation of the tool'to apply torsional force to the shield tube to diametrically contract the latter subject to ulti mate withdrawal from the castconcrete mass.

Fig. 515 a-transverse sectional view, taken onr line '5-5 in Fig. l,.but drawn on-an enlarged" scale; and Fig. 6 is a transverse sectional view,

taken online66 in Fig. 4, and also drawn on an enlarged scale. r 1

Fig. 'I is a perspective view ofa simplified form of shield tube manipulating and extracting tool according to this invention.

Similar characters of reference are employed in the above described views, to indicate corresponding parts.

In the drawings, the reference character I indicates the concrete mass which surrounds the shield tube I l desiredto be removed therefrom.

A preferred-form of the shield tube manipulating and extracting tool is shown in Figs. 1 to 6 inclusive, and comprises a longitudinal bar,pr ef-i erably of round cross-sectional shape and of suitable length, having aflixed to its rearward end, by the hub member 20, a cross-bar 2| which serves as a hand grip or handle by which the tool may be operatively manipulated. The tool bar is-1ongitudinally split diametrically to divide the same, into twoopposed gripper sections 22 and 23. ,One I of said gripper sections, as 22, terminates at its free forward end in ataperedleading end 24, theinner face 25 of which-is chamfered to provide an inner inclined facedivergently extending from its interior face'21 toits extremity. The freeend 28 of -the other gripper section 23 is also of prefer ably tapered conformation but terminatesshort of the leading end 24 of the gripper section 22 so as to be stepped back therefrom. vBy this ar-' rangement, the advanced leading. end N-of, the gripper section 22 afiords means for-quick andeasy insertion of the forward'end ofthe tool between an exterior surface of the shield tube 1 l1 and the contiguous surface of the concrete mass I 0, whereby the tool'may be thereafter thrust inwardly into" engagement withthe shield tube I in such m'annerthat a wall portioniof the latter entersand is engaged between the opposed interior faces 21 and 29 respectively of the gripper sections 22 and 23. The'conformation of the end' portions of said gripper sections22 and 23 is sub ,ject to more or lessyariation, although preferably one section should have a wedgc'or chisel shaped end portion which leads or is advanced beyond the end portion of the other gripper section.

Preferably the gripper section 23, which, upon insertion of the tool in operative engagement 'witha shield tube to be manipulated, lies along an interior surface of the engaged shield tube wall, is cut away, as at 30, along its top longitudinal margin, whereby to step down its top margin relative to the top margin of theopposed gripper section 22, so that when the tool grips the shield tube wall, and is thereupon rotated clockwise to torsionally twist the shield tube, clearance will be provided for the reception and passage of the shield tube wall around the external face of said gripper section 23 (see Fig. 6), thereby avoiding frictional rubbing of the shield tube wall againstlthe contiguous surface of the surrounding concrete mass, and possible consequent fracture or disintegration of such wall part.

Slidably mounted for longitudinal movement over the gripper sections 22 and 23 comprising The leading tapered end portion 24-25 of the gripper section 22 is first inserted between a side of the shield tube H and the contiguous surface of the concrete mass, whereupon the tool is thrust inward so as to engage the wall of the shield tube between the gripper sections 22 and 23, wherebythe gripper section 22 is disposed along the external surface of said shield tube wall and the gripper section 23 along the. internal surface thereof. The tool being this initially applied to a shield tube desired to be manipu- 1ated, the sleeve 3| is slid forward until it abuts the shield tube end, asshown by broken lines in Figs. '1', '2 and 3.- As said sleeve 3| is thus moved the tool bar is a combined clamp and bearing sleeve 3|. This sleeve 3| is provided at its rearward end with an annular'diametrically enlarged head 32, which also provides a stop shoulder 33.

Engaged through said head '32 to project into the bore of said sleeve isa stop screw 34. The upper longitudinalmargin of the gripper section 22 is provided with a cutaway portion adapted to provide a runway 35 for said stop screw 34;

said run vay terminating at its forward end in'a stop shoulder 36 engageable by said stop screw 34 to 'limit forward sliding movement of the sleeve 3 and at its rearward end in a stop shoulder 31 engageable by said stop screw 34 to limit rearward sliding movement ofsaid sleeve 3|.

Preferably ,said sleeve is of tapering conformer-- the shield tube to be manipulated and withdrawn from a surrounding concrete mass.

In a concrete form, the walls thereof are usually held in spaced assembled relation by suitable tying and retaining means, including tierods which extend across the form interior. The internally disposed parts of the tie-rods are protected from contact with the concrete castin the form by enveloping the same in shield'tubes over the forward end portions of the gripper sections 22 and 23, it forces the latter toward each other so as to firmlygrip and clamp the shield tube wall portionv engaged therebetween.

The tool being thus operatively related to a shield tube desired to be manipulated and 8X tract ed the operatorthereupon rotates the tool clockwise about its longitudinal axis, thereby torsionally twisting the tube (see Figs-stand 6), The torsional force thus applied to the shield tube twists the same with-diametricallycontracting effect thereupon, thus operating to sep I arate its external surfaces from the contiguous surfaces of the surrounding concrete. This twist-' ing of the shield tube is also accompanied by a longitudinal contraction thereof, which causes the sleeve 3| to enter the opening in the con- .crete mass '(see Fig. 4).: As thus entered in said opening, the' sleeve 3l also serves as abearing in support of the rotation of the tool. shield tubes are-of considerablelength, inward penetration of the sleeve and tool will be limited byabutment 'o'fthe'stop shoulder 33, vpro- .7

vided by the sleeve head 32, against the exterior face of the concrete mass l0, and consequently the shield tube'will be compelled to move-outward, and willthus be entirely loosened from the concrete.

tinuing to rotate the same with the other hand. Such manipulation maintains the contracted loosened condition ofthe shield tube while it is being bodily withdrawn' out of the opening in the concrete mass. u

In some cases it is desired to remove only an,

. outlying end portion ofthe, shield tube separable whereby the cast/concrete mass is prevented 1 from contacting with and adhering to the tierods. After the cast concrete hasset the form 'may be dismantledby releasing the tying and retaining devices, and then stripping away the form walls and withdrawing tie-rods so as to merel leave within the concrete mass said shield tubes i Q After the form walls have been stripped away from the completed concrete structure, the outer end portions of the shield tubes II will be exposed at the faces of the concrete mass, subject to the-application thereto of the above described tool, whereby :said tubes may be manipulated and extracted from the concrete.

To apply the novel tool to a shield tube end,

the sleeve 3| is first retracted on the tool bar to the rearward position thereof, as shown by full lines in Figs. 1, 2 and 3 of the drawings.

or adapted to 'beseparated-from the main body.

of the latter which may be left toremainin the interior part of the concrete mass. If the tube end portion is separable fromthe main body, the

tool, when manipulated, will quicklycontract,

loosen and withdraw the ame; and I haveQfoimd that by providing the'extremity of the end'portion 28 01' the gripper. section 23 with-a sharp cutting edge, rather than a dull or blunt edge, such sharp edge will tend to score or cut the shield tubewall, whereby an end portion ,of the tube may be easily torn away and separated from the main body thereof for removal.

From the above it will be readily understood that the 'tool functions in-use to quickly loosen andgremove a, shield tube, in whole or in part, from its initial imbedded disposition within, the mass of a concrete structure,.so that when removed, the voids in said mass maybe plugged with cementfand closed in'accordance with required standard practice,

While the tool in the form above described affords a preferred construction thereof, I am When the shield tube has been 1oose'ned,'the operator may: grasp-the hand grip member or collar 38 with one hand and thereby exert an outward pull upon the tool while conaware that various changes could be made therein, and that the same may well be modified in one respect or another. Illustrative of this, I *have shown in Fig. 7 of the drawings, a somewhat simplified form of the tool. which embodies, however, the general principles of this invention. As shown, this simplified form of the tool comprises amain body or bar 40, having a bifurcated free end portion which forms opposed gripper sections 4| and 42 bounding an intermediate slot 43 adapted to receive the wall of a shield tube to which the tool is operatively applied, and having at its rearward end a cross-bar handle portion 44. A washer 45 may be mounted on the body or bar 40 rearwardly of the gripper sections, the same being stopped in desired position by a cotter pin 46, which is passed through the body or bar 40. It will be obvious that this modified form of the tool may be applied to a shield tube so as to grip the wall thereof subject to turning for application of torsional force to said tube to loosen the same from the surrounding concrete mass, so that the same may then be withdrawn from the latter; The washer 45 may serve as a stop to limit inward movement of the tool under foreshortening pull of the contracted shield tube.

Having now described my invention, I claim:

1. A tool for the purposes described comprising, a tool bar having a handle means at its rearward end portion, a bifurcated free end-portion. to provide opposed gripper sections adapted to straddle and grip the wall of a shield tube to be manipulated, and a stop means mounted on the tool bar rearwardly of said gripper sections.

2. A tool for the purposes described comprising, a tool bar having a handle means at its rearward end portion, a bifurcated free end portion to provide opposed gripper sections adapted to straddle and grip the wall of a shield tube to be manipulated, and one of said gripper sections having a chamfered extremity projecting beyond the extremity of the other gripper section.

3. A tool for the purposes described comprising, a tool bar having a handle means at it rearward end portion, a bifurcated free end portion to provide opposed gripper sections adapted to straddle and grip the wall of a shield tube to be manipulated, one of said gripper sections having a chamfered extremity projecting beyond the extremity of the other gripper section, and a stop means mounted on the tool bar rearwardly of said gripper sections.

4. A tool for the purposes described comprising, a tool bar having a handle means at its rearward end portion, at least the forward end portion of said tool bar being divided longitudinally to provide opposed gripper sections adapted to straddle and grip the wall of a shield tube to be manipulated, and a sleeve slidably mounted on said tool bar subject to forward movement thereon, whereby to force and hold said opposed gripper ections in gripping relation to the shield tube wall engaged therebetween.

5. A tool for the purposes described compristo provide opposed gripper sections adapted to ing, a tool bar having a handle means at its rearward end portion, at least the forward end portion of said tool bar being divided longitudinally to provide oppposed gripper sections adapted to straddle and grip the wallof a shield tube to be manipulated, a sleeve slidably mounted on said tool bar subject to forward movement thereon, whereby to force and hold said opposed gripper sections in gripping relation to the shield tube wall engaged therebetween, and one of said gripper sections having a chamfered extremity projecting beyond the extremity of the other gripper section.

6. A tool for the purposes described comprising, a tool bar having a handle means at its rearwhereby to .force and hold said opposed gripper sections in gripping relation to the shield tube wall engaged therebetween, said sleeve having a diametrically enlarged stop head at its rearward end.

7. A tool for the purposes described and as defined in claim 6 including a hand grip element mounted on the tool bar behind the handle means thereof, to which hand grip element said tool bar is rotatably related.

8. A tool for the purposes described and as defined in claim 4 including a hand grip element mounted on the tool bar behind the handle means thereof, to which hand grip element said tool bar is rotatably related.

9. A tool for the purposes described comprising, a tool bar having a handle means at its rearward end portion, at least the forward end portion of said tool bar being divided longitudinally straddle and grip the wall of a shield tube to be manipulated, one of said gripper sections having a chamfered extremity projecting beyond the extremity of the other gripper section, said latter gripper section being of reduced width whereby to downwardly offset a longitudinal margin thereof below that of the opposed gripper section, a sleeve slidably mounted on said tool bar subject to forward movement thereon, whereby to force and hold said opposed gripper sections in grip.- ping relation to the shield tube wall engaged therebetween, said sleeve having a diametrically enlarged stop head at its rearward end, means to limit sliding movements of said sleeve, and a hand grip element mounted on the tool bar behind the handle means thereof, to which hand grip element said tool bar is rotatably related.

, SAMUEL S. COLT. 

